I have a GSD that ate his feces on all occasions,esp when he had allergies and i had to give him medicine. I tried everything but this worked. At first i had to give him large amounts at each meal. Then i weaned him back to smaller amounts over very gradual time periods. I have also used canned pineapple in his dry food, alternatively, and that works to add fiber and make the fecal not smell the same. But i always keep this on hand.